Here is the full list of all 37 Steredenn achievements.
Dies 50 times.
Kill 2500 fighters.
Pick 15 differents weapons.
Kill 1000 enemies.
Kill 500 fighters.
Destroy a Frigate boss.
Kill 250 enemies.
Destroy a Bomber boss.
Kill 50 enemies.
Kill 10000 fighters.
Destroy 100 cargos.
Kill a spy with the flamethrower.
Destroy a Destroyer boss.
Destroy a Cruiser boss.
Destroy a Carrier boss.
Destroy a Battleship boss.
Meet the Mothership.
Destroy the Mothership.
Destroy the Nemesis.
Pick all weapons at least once.
Pick all Energy weapons.
Pick all Bullets weapons.
Pick all Heavy weapons.
Pick all Bots weapons.
Pick all Melee weapons.
Finish the game once.
Finish the first loop.
Defeat all the bosses in the Arena at least once.
Try all upgrades.
Beat the game using the Blaster only.
Destroy the Alien ship.
Destroy the Old Friend.
Destroy the Garbage Collector.
Destroy the Astroworm.
Beat the Red Baron
Destroy the Super Chabal.
Complete a boss rush.